Deformation characteristics and strain-compensated constitutive equation for AA5083 aluminum alloy under hot compression
(1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. Guangxi Liuzhou Yinhai Aluminum Co., Ltd., Liuzhou 545006, China)
2. Guangxi Liuzhou Yinhai Aluminum Co., Ltd., Liuzhou 545006, China)
Abstract: The hot deformation behavior of AA5083 aluminum alloy was studied using isothermal compression tests with a Gleeble-3500 thermal simulator at strain rate of 0.01-10 s-1 and at temperature of 300-500 °C. The experimental results indicate that dynamic recrystallization (DRX) tends to occur at high strain rates and temperatures, and therefore the flow stress is decreased. To predict the flow behavior under different deformation conditions, a strain-compensated constitutive equation based on Arrhenius- type equation and Zener–Hollomon parameters was proposed. The flow stresses obtained from the constitutive equation are consistent with the experimental results. The average absolute relative error is only 4.52% over the entire experimental range, indicating that the proposed constitutive equation exhibits high prediction precision for the hot deformation behavior of AA5083 aluminum alloy.
Key words: hot deformation; AA5083; dynamic recrystallization; constitutive equation